Velleman PCSGU250
The PCSU250 is an inexpensive USB-based oscilloscope. It has 2 channels, an analog bandwidth of 12MHz and 25MS/s sampling rate. Additionally a signal generator is included.
See Velleman PCSU250/Info for more details (such as lsusb -vvv output) about the device.
Hardware
Control logic
- Xilinx XC3S50 50K-gate FPGA
- 50MHz crystal: 50.000 Y0KE (clock source for the Xilinx FPGA)
- Microchip PIC18LF2450-I/SP 8-bit microcontroller
USB interface
- Inluded in the PIC.
Analog frontend
- 4 x SIR-S4-105A IZ Goodsky 5V relay (2 per input channel)
- 2 x Texas Instruments OPA2354 op-amps
- 1 x Analog Devices AD9288BST-40 Dual 8-bit 40MSPS A/D converters
Power
- 3 x Texas Instruments TPS766xx voltage regulators (IC19=1V, IC20=2.5V, IC21=3.3V)
Trigger Level
- 74HCT4051D 8-channel analog multiplexer/demultiplexer with 15 resistors, is that a R2R DAC??? I would guess this one is for the trigger level
Signal Generator
- DAC0800LCM 8-Bit Digital-to-Analog Converter Settling Time 0.1 µs, does that mean max. 10Mhz Sample rate?
- TL081C JFET OPAMP
- lm6172 Dual High Speed, Low Power, Low Distortion Voltage Feedback Amplifiers 100Mhz GBW
Photos
Device, front
PCB, front
PCB, back
Signal generator or trigger circuit?
Output stage
Chunk of rusty metal for weight
Protocol
- https://bitbucket.org/abbradar/scope/src
- http://forum.velleman.eu/viewtopic.php?f=10&t=3586&start=15
- https://app.box.com/s/cxybc16r7o5kqb65u6ct